I'm trying to get a track into rF2 and it's loade correctly in dev mode, but there is something very strange… Marbles stays on the track all the time and I don't know why.
You possibly have vertex alpha or vertex color on your road mesh. Check that vertices are white with 100% alpha.
Problem solved, I'm newbie on track creation and I have forgotten to rename all road object with Racesurface_ prefix